Bathtub mat



FIG. 1 is a front and right side perspective view of a bathtub matshowing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view; _

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view; and

FIG. 7 is an enlarged fragmentary sectional view of the area of the matindicated by arrows 8 in FIG. 6.

The ornamental design for a bathtub mat, substantially as shown anddescribed.